May 2011 Weather History at Seattle-Tacoma International Airport Washington, United States

This report shows the past weather for Seattle-Tacoma International Airport, providing a weather history for May 2011. It features all historical weather data series we have available, including the Seattle-Tacoma International Airport temperature history for May 2011. You can drill down from year to month and even day level reports by clicking on the graphs.

Seattle-Tacoma International Airport Temperature History May 2011

Temperature history in May 2011 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313135°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°FAprJun
The daily range of reported temperatures (gray bars) and 24-hour highs (red ticks) and lows (blue ticks), placed over the daily average high (faint red line) and low (faint blue line) temperature, with 25th to 75th and 10th to 90th percentile bands.

Hourly Temperature in May 2011 at Seattle-Tacoma International Airport

Hourly Temperature in May 2011 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAprJunvery coldcoldcool
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The hourly reported temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
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Cloud Cover in May 2011 at Seattle-Tacoma International Airport

Cloud Cover in May 2011 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAprJun
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
no significant cloudno cloud detectedceiling and visibility ok
The hourly reported cloud coverage, categorized by the percentage of the sky covered by clouds.

Daily Precipitation in May 2011 at Seattle-Tacoma International Airport

Daily Precipitation in May 2011 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 inAprJun
The daily measured quantity of liquid or liquid-equivalent precipitation.

Observed Weather in May 2011 at Seattle-Tacoma International Airport

Observed Weather in May 2011 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAprJun
foghazedrizzlelight rainmoderate rainheavy rainfreezing rainsleetsnow grainslight snowmoderate snowheavy snowhailthunderstorm
The hourly observed weather, color coded by category (in order of severity). If multiple reports are present, the most severe code is shown.
DayObservationsPrecipitationCodes
Mon, May 2 Light Rain, Mist0.18 in-RA, BR
Tue, May 3 Light Rain0.00 in-RA
Thu, May 5 Light Rain0.03 in-RA
Fri, May 6 Rain, Light Rain, Mist0.13 inRA, -RA, BR
Sat, May 7 Light Rain, Mist0.04 in-RA, BR
Sun, May 8 Light Rain0.02 in-RA
Wed, May 11 Light Rain, Mist0.42 in-RA, BR
Sat, May 14 Rain, Light Rain, Mist0.70 inRA, -RA, BR
Sun, May 15 Rain, Light Rain, Fog, Mist0.88 inRA, -RA, FG, BR
Sat, May 21 Light Rain, Mist0.04 in-RA, BR
Wed, May 25 Rain, Light Rain, Mist0.41 inRA, -RA, BR
Thu, May 26 Light Rain0.01 in-RA
Fri, May 27 Rain, Light Rain0.01 inRA, -RA
Sat, May 28 Light Rain0.01 in-RA
Mon, May 30 Light Rain0.00 in-RA
Tue, May 31 Rain, Light Rain, Mist0.11 inRA, -RA, BR

Hours of Daylight and Twilight in May 2011 at Seattle-Tacoma International Airport

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

Sunrise & Sunset with Twilight in May 2011 at Seattle-Tacoma International Airport

Sunrise & Sunset with Twilight in May 2011 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031312 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAprJun5:17 AM5:17 AMMay 318:57 PMMay 318:57 PM5:52 AM5:52 AMMay 18:20 PMMay 18:20 PM5:37 AM5:37 AMMay 118:34 PMMay 118:34 PM5:25 AM5:25 AMMay 218:46 PMMay 218:46 PM
The solar day over the course of May 2011. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Solar Elevation and Azimuth in May 2011 at Seattle-Tacoma International Airport

Solar Elevation and Azimuth in May 2011 at Seattle-Tacoma International AirportMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAprJun00101020203030404050506060001010202030304040505060
northeastsouthwest
Solar elevation and azimuth over the course of May 2011. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

Moon Rise, Set & Phases in May 2011 at Seattle-Tacoma International Airport

Moon Rise, Set & Phases in May 2011 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAprJunMay 211:51 PMMay 211:51 PMMay 174:09 AMMay 174:09 AMJun 12:03 PMJun 12:03 PM5:12 AM5:12 AM8:20 PM8:20 PM8:22 PM8:22 PM5:23 AM5:23 AM4:57 AM4:57 AM9:13 PM9:13 PM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
May 2011IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
2%4:47 AMENE7:15 PMWNW-11:57 AMS251,218 mi
2
0%5:12 AMENE8:20 PMWNW-12:42 PMS249,992 mi
3
0%5:41 AMENE9:23 PMWNW-1:29 PMS248,425 mi
4
2%6:17 AMENE10:24 PMNW-2:18 PMS246,582 mi
5
7%7:01 AMNE11:20 PMNW-3:10 PMS244,508 mi
6
13%7:53 AMNE--4:02 PMS242,232 mi
7
21%-12:08 AMNW8:54 AMENE4:55 PMS239,776 mi
8
31%-12:50 AMWNW10:02 AMENE5:47 PMS237,176 mi
9
41%-1:24 AMWNW11:14 AMENE6:38 PMS234,493 mi
10
50%-1:54 AMWNW12:28 PMENE7:28 PMS231,832 mi
11
65%-2:20 AMWNW1:44 PME8:17 PMS229,347 mi
12
76%-2:45 AMW3:01 PME9:07 PMS227,239 mi
13
85%-3:09 AMW4:20 PME9:59 PMS225,733 mi
14
93%-3:36 AMWSW5:41 PMESE10:54 PMS225,044 mi
15
98%-4:05 AMWSW7:02 PMESE11:51 PMS225,331 mi
16
99%-4:40 AMWSW8:22 PMESE--
17
100%-5:23 AMWSW9:35 PMSE12:52 AMS226,654 mi
18
99%-6:14 AMSW10:38 PMSE1:55 AMS228,946 mi
19
95%-7:15 AMSW11:29 PMSE2:57 AMS232,016 mi
20
89%-8:22 AMWSW-3:55 AMS235,579 mi
21
81%12:10 AMESE9:31 AMWSW-4:50 AMS239,312 mi
22
72%12:42 AMESE10:40 AMWSW-5:40 AMS242,901 mi
23
62%1:08 AMESE11:47 AMWSW-6:27 AMS246,076 mi
24
50%1:30 AMESE12:52 PMW-7:10 AMS248,634 mi
25
42%1:51 AME1:55 PMW-7:51 AMS250,442 mi
26
33%2:10 AME2:58 PMW-8:32 AMS251,439 mi
27
24%2:30 AME4:01 PMWNW-9:12 AMS251,633 mi
28
16%2:51 AMENE5:04 PMWNW-9:54 AMS251,086 mi
29
10%3:14 AMENE6:08 PMWNW-10:38 AMS249,907 mi
30
4%3:42 AMENE7:13 PMWNW-11:24 AMS248,232 mi
31
1%4:16 AMENE8:15 PMNW-12:13 PMS246,211 mi

Humidity Comfort Levels in May 2011 at Seattle-Tacoma International Airport

Humidity Comfort Levels in May 2011 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAprJun
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The hourly reported humidity comfort level, categorized by dew point. The shaded overlays indicate night and civil twilight.

Wind Speed in May 2011 at Seattle-Tacoma International Airport

Wind Speed in May 2011 at Seattle-Tacoma International Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mph30 mph30 mph35 mph35 mphAprJun
The daily range of reported wind speeds (gray bars), with maximum gust speeds (red ticks).

Hourly Wind Speed in May 2011 at Seattle-Tacoma International Airport

Hourly Wind Speed in May 2011 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAprJun
0 mph calm 1 mph light air 4 mph light breeze 8 mph gentle breeze 13 mph moderate breeze 18 mph fresh breeze 25 mph strong breeze 31 mph near gale 39 mph gale 47 mph strong gale 55 mph storm 64 mph violent storm 73 mph hurricane force
The hourly reported wind speed, color coded into bands according to the Beaufort scale. The shaded overlays indicate night and civil twilight.

Hourly Wind Direction in 2011 at Seattle-Tacoma International Airport

Hourly Wind Direction in 2011 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAprJun
calmnortheastsouthwest
The hourly reported wind direction, color coded by compass point. The shaded overlays indicate night and civil twilight.

Atmospheric Pressure in May 2011 at Seattle-Tacoma International Airport

Atmospheric Pressure in May 2011 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313129.6 inHg29.6 inHg29.8 inHg29.8 inHg30.0 inHg30.0 inHg30.2 inHg30.2 inHg30.4 inHg30.4 inHg30.6 inHg30.6 inHgAprJun
The daily range of atmospheric pressure (gray bars), as measured by the altimeter setting reported in e.g. a METAR report.

Number of Reports by Day in May 2011 at Seattle-Tacoma International Airport Spring 2011

Number of Reports by Day in May 2011 at Seattle-Tacoma International Airport181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131002020404060608080AprJun
regularspecialcorrection
The number of reports per day.

Reports by Hour in May 2011 at Seattle-Tacoma International Airport Spring 2011

Reports by Hour in May 2011 at Seattle-Tacoma International Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAprJun
regularspecialcorrection
Indication of what types of reports were recorded during each hour.

This report graphically illustrates the historical weather reports recorded by the weather station at Seattle-Tacoma International Airport in May 2011.

METAR Reports

Airport weather stations throughout the world routinely issue METAR weather reports . Such reports are used by pilots, air traffic controllers, meteorologists, climatologists, and other researchers. They are published via radio transmission and on the internet. We have been collecting and archiving published METAR reports since 2011, and have found third-party sources for archived reports from years prior to that.

ISD Reports

The Integrated Surface Database (ISD), maintained and published by NOAA's National Center for Environmental Information , consists of hourly and synoptic weather reports from a variety of sources. We use ISD data to complement and backfill for our METAR archive.

Other Data

The sources for the averages shown in the daily temperature chart are discussed in greater detail on this station's Averages Report.

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

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